261562249931 has 4 divisors (see below), whose sum is σ = 261673983264. Its totient is φ = 261450516600.

The previous prime is 261562249913. The next prime is 261562249943. The reversal of 261562249931 is 139942265162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261562249931 - 2¹⁴ = 261562233547 is a prime.

It is a super-2 number, since 2×261562249931² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261562249931.

It is not an unprimeable number, because it can be changed into a prime (261562249961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55863155 + ... + 55867836.

It is an arithmetic number, because the mean of its divisors is an integer number (65418495816).

Almost surely, 2^261562249931 is an apocalyptic number.

261562249931 is a deficient number, since it is larger than the sum of its proper divisors (111733333).

261562249931 is a wasteful number, since it uses less digits than its factorization.

261562249931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111733332.

The product of its digits is 1399680, while the sum is 50.

The spelling of 261562249931 in words is "two hundred sixty-one billion, five hundred sixty-two million, two hundred forty-nine thousand, nine hundred thirty-one".